CN101698920B - High-purity ferrochrome and preparation method thereof - Google Patents
High-purity ferrochrome and preparation method thereof Download PDFInfo
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- CN101698920B CN101698920B CN2009102162334A CN200910216233A CN101698920B CN 101698920 B CN101698920 B CN 101698920B CN 2009102162334 A CN2009102162334 A CN 2009102162334A CN 200910216233 A CN200910216233 A CN 200910216233A CN 101698920 B CN101698920 B CN 101698920B
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Abstract
The invention discloses high-purity ferrochrome, comprising the following ingredients by weight ratio: 85.0-100 percent of Cr, 0-0.01 percent of C, 0-0.5 percent of Si, 0-0.02 percent of S, 0-0.01 percent of P, 0-0.01 percent of H, 0-0.1 percent of O, 0-0.01 percent of N, 0-14 percent of Fe and 0-0.34 percent of other oxide impurities. The invention further provides a preparation method of high-purity ferrochrome; compared with the purity of the common ferrochrome, the purity of the high-purity ferrochrome in the invention is higher; in addition, the carbon content is low, specific gravity ofthe high-purity ferrochrome is higher than that of the common ferrochrome, and the oxide impurity content is low, therefore, the high-purity ferrochrome can replace expensive chromium metal under a certain condition while the cost is reduced by 50 percent; furthermore, the invention provides preparation method of high-purity ferrochrome, so as to provide reference for preparing the high-purity ferrochrome.
Description
Technical field
The present invention relates to a kind of ferrochrome and its preparation method, specifically is high-purity ferrochrome of a kind of high chromium content and preparation method thereof.
Background technology
At present, the higher ferrochrome of purity mainly contains two kinds, be respectively the ferrochrome that is called as " extra low carbon ferrochromium " and " vacuum ferrochrome ", wherein extra low carbon ferrochromium is the ferrochrome of producing with electro-silicothermic process, and the vacuum ferrochrome is the ferrochrome that utilizes vacuum resistance furnace to adopt the technology of solid-state decarburization to make.Count by weight percentage, in the extra low carbon ferrochromium, the content of Cr is about 60.0%, and C content is no more than 0.06%, even also the carbon in the ferrochrome can only be dropped to 0.03% by state-of-the-art Bo Lunfa, the content of hazardous elements S, P, Si and obnoxious flavour element H, O, N is higher in the extra low carbon ferrochromium; Cr content can reach 67.0% in the vacuum ferrochrome, content is than the content height of extra low carbon ferrochromium Cr, and the content of part harmful element is also low than the content in the extra low carbon ferrochromium, but vacuum ferrochrome proportion is little, the oxide inclusion content height is as the additive of some special iron and steel and high temperature corrosion-resisting steel alloy the time, during ingot crystal, inclusion is present in the steel ingot, tissue defects such as cracks when causing steel rolling.
Summary of the invention
But the invention provides a kind of high-purity ferrochrome of part alternative metals chromium.
A kind of high-purity ferrochrome, it is characterized in that described ferrochrome is become to be grouped into by following weight ratio: Cr is 85.0～100%, C is 0～0.01%, and Si is 0～0.5%, and S is 0～0.02%, P is 0～0.01%, H is 0～0.01%, and O is 0～0.1%, and N is 0～0.01%, Fe is 0～14.0%, and other oxide impurities are 0～0.34%.
The present invention also provides the preparation method of above-mentioned high-purity ferrochrome, comprises the steps:
Step 1, high carbon ferro-chrome and chromoxide green are worn into 400 purpose fine powders respectively with roller mill, stir high-carbon chromium iron and chromoxide green powder are mixed, oxygen to carbon atom ratio is 1.2～1.5 in the control mixture, add the polyvinyl alcohol caking agent that accounts for described mixture weight 5% then, continue stirring and evenly mixing, with pressing machine blended stock is pressed into bulk, again the block compound that the presses drying room of packing into, control drying room temperature is 290～310 ℃, by sample examination moisture, less than after 0.5%, block compound is transplanted on vacuum resistance furnace, feeding temperature-raising etc. moisture content in the block compound, keep 1400～1500 ℃ of the interior temperature of vacuum oven, vacuum tightness 100Pa～800Pa carries out vacuum decarburization, judge carbon content in the block compound by the vacuum tightness in the stove, when vacuum tightness during less than 15Pa, the carbon content in the block compound is less than 0.01%, the cooling that has a power failure is reduced to and is come out of the stove below 100 ℃ etc. furnace temperature;
Step 2 after the block compound of coming out of the stove manually is broken into the particle of 10～100cm diameter again, adds in the vacuum induction furnace, add simultaneously account for particle weight 2%～8% by CaF
2And CaC
2The desulfurization dephosphorization agent of forming, wherein CaF
2And CaC
2Mix according to 3: 2 weight ratios, control vacuum tightness is 100～300Pa intensification fusing, produces induction stirring, waits material to melt back vacuum pouring in vacuum pouring machine fully and becomes piece, promptly makes high-purity ferrochrome.
In above-mentioned steps,
The weight percent content of C is 8%～10% in the described high carbon ferro-chrome, and the weight percent content of Cr is not less than 72%.
Described polyvinyl alcohol binding agent is formulated according to 3: 100 mixed of weight ratio by the polyethylene alcohol and water.
Among the present invention, after chromoxide green and the high carbon ferro-chrome ground and mixed, by chromoxide green as oxygenant, in vacuum resistance furnace, remove the carbon in the mixture during vacuum decarburization, thereby the content of carbon in the high-purity ferrochrome among reduction the present invention, simultaneously, during vacuum decarburization, constantly hydrocarbon is extracted out with vacuum pump, made that the vacuum tightness in the vacuum resistance furnace constantly reduces, because the highest attainable vacuum of vacuum resistance furnace is 15Pa at present, therefore, when vacuum tightness reached 15Pa, the expression decarburization was finished, and the carbon content in the alloy is less than 0.01%.In addition, desulfurization dephosphorization agent CaF
2, CaC
2Adding, and utilize induction stirring, can enlarge desulfurization, dephosphorization and the contact area and the speed of response of melting alloy, impel slag from alloy liquid, to float simultaneously, chromium hot melt is removed oxide inclusion, slough the sulphur in the ferrochrome simultaneously, harmful elements such as phosphorus reach the purpose that the present invention produces high-purity ferrochrome.
The more common ferrochrome purity of high-purity ferrochrome purity provided by the invention height, and carbon content is low, and proportion is bigger than common ferrochrome, and oxide impurity content is low, can be used under certain condition replace expensive chromium metal, but cost reduces by 50%; The preparation method of the high-purity ferrochrome that provides simultaneously can provide a kind of reference for the preparation high-purity ferrochrome.
Embodiment
Embodiment one
A kind of preparation method of high-purity ferrochrome comprises the steps:
Step 1, high carbon ferro-chrome and chromoxide green are worn into 400 purpose fine powders respectively with roller mill, stir high-carbon chromium iron and chromoxide green powder are mixed, oxygen to carbon atom ratio is 1.3 in the control mixture, add the polyvinyl alcohol caking agent that accounts for described mixture weight 5% then, continue stirring and evenly mixing, with pressing machine blended stock is pressed into bulk, again the block compound that the presses drying room of packing into, control drying room temperature is 300 ℃, by sample examination moisture, less than after 0.5%, block compound is transplanted on vacuum resistance furnace, feeding temperature-raising etc. moisture content in the block compound, keep 1450 ℃ of the interior temperature of vacuum oven, vacuum tightness 400Pa carries out vacuum decarburization, judge carbon content in the block compound by the vacuum tightness in the stove, when vacuum tightness during less than 15Pa, the carbon content in the block compound is less than 0.01%, the cooling that has a power failure is reduced to and is come out of the stove below 100 ℃ etc. furnace temperature;
Step 2 after the block compound of coming out of the stove manually is broken into the particle of 10～100cm diameter again, adds in the vacuum induction furnace, add simultaneously account for particle weight 4% by CaF
2And CaC
2The desulfurization dephosphorization agent of forming, wherein CaF
2And CaC
2Mix according to 3: 2 weight ratios, control vacuum tightness is 200Pa intensification fusing, produces induction stirring, waits material to melt back vacuum pouring in vacuum pouring machine fully and becomes piece, promptly makes high-purity ferrochrome.
In above-mentioned steps,
The weight percent content of C is 9% in the described high carbon ferro-chrome, the weight percent content 73% of Cr.
Described polyvinyl alcohol binding agent is formulated according to 3: 100 mixed of weight ratio by the polyethylene alcohol and water.
Embodiment two
A kind of preparation method of high-purity ferrochrome comprises the steps:
Step 1, high carbon ferro-chrome and chromoxide green are worn into 400 purpose fine powders respectively with roller mill, stir high-carbon chromium iron and chromoxide green powder are mixed, oxygen to carbon atom ratio is 1.5 in the control mixture, add the polyvinyl alcohol caking agent that accounts for described mixture weight 5% then, continue stirring and evenly mixing, with pressing machine blended stock is pressed into bulk, again the block compound that the presses drying room of packing into, control drying room temperature is 310 ℃, by sample examination moisture, less than after 0.5%, block compound is transplanted on vacuum resistance furnace, feeding temperature-raising etc. moisture content in the block compound, keep 1500 ℃ of the interior temperature of vacuum oven, vacuum tightness 800Pa carries out vacuum decarburization, judge carbon content in the block compound by the vacuum tightness in the stove, when vacuum tightness during less than 15Pa, the carbon content in the block compound is less than 0.01%, the cooling that has a power failure is reduced to and is come out of the stove below 100 ℃ etc. furnace temperature;
Step 2 after the block compound of coming out of the stove manually is broken into the particle of 10～100cm diameter again, adds in the vacuum induction furnace, add simultaneously account for particle weight 8% by CaF
2And CaC
2The desulfurization dephosphorization agent of forming, wherein CaF
2And CaC
2Mix according to 3: 2 weight ratios, control vacuum tightness is 300Pa intensification fusing, produces induction stirring, waits material to melt back vacuum pouring in vacuum pouring machine fully and becomes piece, promptly makes high-purity ferrochrome.
In above-mentioned steps,
The weight percent content of C is 10% in the described high carbon ferro-chrome, the weight percent content 75% of Cr.
Described polyvinyl alcohol binding agent is formulated according to 3: 100 mixed of weight ratio by the polyethylene alcohol and water.
Embodiment three
The present invention also provides the preparation method of above-mentioned high-purity ferrochrome, comprises the steps:
Step 1, high carbon ferro-chrome and chromoxide green are worn into 400 purpose fine powders respectively with roller mill, stir high-carbon chromium iron and chromoxide green powder are mixed, oxygen to carbon atom ratio is 1.2 in the control mixture, add the polyvinyl alcohol caking agent that accounts for described mixture weight 5% then, continue stirring and evenly mixing, with pressing machine blended stock is pressed into bulk, again the block compound that the presses drying room of packing into, control drying room temperature is 290 ℃, by sample examination moisture, less than after 0.5%, block compound is transplanted on vacuum resistance furnace, feeding temperature-raising etc. moisture content in the block compound, keep 1400 ℃ of the interior temperature of vacuum oven, vacuum tightness 100Pa carries out vacuum decarburization, judge carbon content in the block compound by the vacuum tightness in the stove, when vacuum tightness during less than 15Pa, the carbon content in the block compound is less than 0.01%, the cooling that has a power failure is reduced to and is come out of the stove below 100 ℃ etc. furnace temperature;
Step 2 after the block compound of coming out of the stove manually is broken into the particle of 10～100cm diameter again, adds in the vacuum induction furnace, add simultaneously account for particle weight 2% by CaF
2And CaC
2The desulfurization dephosphorization agent of forming, wherein CaF
2And CaC
2Mix according to 3: 2 weight ratios, control vacuum tightness is 100Pa intensification fusing, produces induction stirring, waits material to melt back vacuum pouring in vacuum pouring machine fully and becomes piece, promptly makes high-purity ferrochrome.
In above-mentioned steps,
The weight percent content of C is 8% in the described high carbon ferro-chrome, and the weight percent content of Cr is not less than 72%.
Described polyvinyl alcohol binding agent is formulated according to 3: 100 mixed of weight ratio by the polyethylene alcohol and water.
Claims (4)
1. high-purity ferrochrome, it is characterized in that described ferrochrome is become to be grouped into by following weight ratio: Cr more than or equal to 85.0 less than 100%, C is greater than 0 smaller or equal to 0.01%, and Si is greater than 0 smaller or equal to 0.5%, S greater than 0 smaller or equal to 0.02%, P greater than 0 smaller or equal to 0.01%, H is greater than 0 smaller or equal to 0.01%, and O is greater than 0 smaller or equal to 0.1%, N greater than 0 smaller or equal to 0.01%, Fe is greater than 0 smaller or equal to 14.0%, other oxide impurities greater than 0 smaller or equal to 0.34%;
Described high-purity ferrochrome is produced by the following method:
Step 1, high carbon ferro-chrome and chromoxide green are worn into 400 purpose fine powders respectively with roller mill, stir high-carbon chromium iron and chromoxide green powder are mixed, oxygen to carbon atom ratio is 1.2～1.5 in the control mixture, add the polyvinyl alcohol caking agent that accounts for described mixture weight 5% then, continue stirring and evenly mixing, with pressing machine compound is pressed into bulk, again the block compound that the presses drying room of packing into, control drying room temperature is 290～310 ℃, by sample examination moisture, waits in the block compound moisture content less than after 0.5%, block compound is transplanted on vacuum resistance furnace, feeding temperature-raising keeps 1400～1500 ℃ of the interior temperature of vacuum oven, vacuum tightness 100Pa～800Pa carries out vacuum decarburization, when vacuum tightness during less than 15Pa, the cooling that has a power failure is reduced to and is come out of the stove below 100 ℃ etc. furnace temperature;
Step 2 after the block compound of coming out of the stove manually is broken into the particle of 10～100cm diameter again, adds in the vacuum induction furnace, add simultaneously account for particle weight 2%～8% by CaF
2And CaC
2The desulfurization dephosphorization agent of forming, wherein CaF
2And CaC
2According to 3: 2 weight ratios mixing, control vacuum tightness was 100～300Pa intensification fusing, produces induction stirring, waited the mixing particle to melt back vacuum pouring in vacuum pouring machine fully and became piece, promptly made high-purity ferrochrome;
The weight percent content of Cr is not less than 72% in the wherein said high carbon ferro-chrome.
2. the production method of the described high-purity ferrochrome of claim 1 is characterized in that comprising following step:
Step 1, high carbon ferro-chrome and chromoxide green are worn into 400 purpose fine powders respectively with roller mill, stir high-carbon chromium iron and chromoxide green powder are mixed, oxygen to carbon atom ratio is 1.2～1.5 in the control mixture, add the polyvinyl alcohol caking agent that accounts for described mixture weight 5% then, continue stirring and evenly mixing, with pressing machine compound is pressed into bulk, again the block compound that the presses drying room of packing into, control drying room temperature is 290～310 ℃, by sample examination moisture, waits in the block compound moisture content less than after 0.5%, block compound is transplanted on vacuum resistance furnace, feeding temperature-raising keeps 1400～1500 ℃ of the interior temperature of vacuum oven, vacuum tightness 100Pa～800Pa carries out vacuum decarburization, when vacuum tightness during less than 15Pa, the cooling that has a power failure is reduced to and is come out of the stove below 100 ℃ etc. furnace temperature;
Step 2 after the block compound of coming out of the stove manually is broken into the particle of 10～100cm diameter again, adds in the vacuum induction furnace, add simultaneously account for particle weight 2%～8% by CaF
2And CaC
2The desulfurization dephosphorization agent of forming, wherein CaF
2And CaC
2According to 3: 2 weight ratios mixing, control vacuum tightness was 100～300Pa intensification fusing, produces induction stirring, waited the mixing particle to melt back vacuum pouring in vacuum pouring machine fully and became piece, promptly made high-purity ferrochrome;
The weight percent content of Cr is not less than 72% in the wherein said high carbon ferro-chrome.
3. the production method of high-purity ferrochrome according to claim 2, the weight percent that it is characterized in that C in the described high carbon ferro-chrome is 8%～10%.
4. the production method of high-purity ferrochrome according to claim 2 is characterized in that described polyvinyl alcohol caking agent is formulated according to 3: 100 mixed of weight ratio by the polyethylene alcohol and water.
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| CN2009102162334A CN101698920B (en) | 2009-11-17 | 2009-11-17 | High-purity ferrochrome and preparation method thereof |
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| CN102994851A (en) * | 2012-10-29 | 2013-03-27 | 海门市金易焊接材料有限公司 | Low-carbon ferrochromium |
| CN103255357B (en) * | 2013-05-17 | 2016-01-20 | 荥经华盛冶金科技有限公司 | A kind of method utilizing stainless steel oxidation iron sheet to produce Ni-Cr-Mn iron alloy |
| US10041146B2 (en) * | 2014-11-05 | 2018-08-07 | Companhia Brasileira de Metalurgia e Mineraçäo | Processes for producing low nitrogen metallic chromium and chromium-containing alloys and the resulting products |
| CN105543515B (en) * | 2015-12-11 | 2017-08-29 | 宁夏维尔铸造有限责任公司 | Utilize the method for intermediate frequency furnace melting ferrochrome |
| CN106591686A (en) * | 2017-01-19 | 2017-04-26 | 西峡县中嘉合金材料有限公司 | Production technology of high-purity micro-carbon ferrochromium |
| CN115011826A (en) * | 2022-05-13 | 2022-09-06 | 徐州宏阳新材料科技股份有限公司 | Preparation method of low-inclusion high-carbon ferrochrome |
| CN115323234B (en) * | 2022-08-09 | 2023-08-01 | 东睦新材料集团股份有限公司 | Preparation method of nonmagnetic low-expansion chromium-based alloy material |
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